Every one of us produces garbage of one kind or another. Getting rid of trash is big business. In large cities, millions of dollars is spent each year on getting rid of our garbage. Some of the garbage is thrown into the sea. Some is burnt or buried under the ground. Every year we need to find about 800,000 cubic metres of empty land just to bury the garbage. This is the same as filling one football stadium with garbage up to 20 metres high, or as high as a seven- storey building!